Apparatus for processing chemical materials held in container structures

ABSTRACT

Incubation apparatus for use with a cuvette having a projecting processing control member and a plurality of chambers, at least one of which contains a stored chemical material includes a cuvette receptacle with adjacent heaters for incubating material in the cuvette, sensor circuitry responsive to the control member of the cuvette in the container receiving structure for producing an output signal as a function of the data provided by the control portion, and a timer responsive to the sensor circuitry for providing a control signal as an indication of the incubation of the cuvette. The receptacle also includes an interlock slot for receiving the projecting control member.

United States Patent Rosse et al.

APPARATUS FOR PROCESSING v CHEMICAL. MATERIALS IIELI) IN CONTAINER STRUCTURES [73] Assignee: Instrumentation Laboratory, lnc.,

Lexington, Mass.

22 Filed: June15, 1972 211 Appl. No.: 263,285

Related US. Application Data [62] Division of Ser. No. 45,758, June 12, 1970, Pat. No.

[52] US. Cl. 235/6l.6 H, 23/230 B, 23/259,

[51] Int. Cl B01] 3/00, GOln 21/24, G06f 9/04 [58] Field of Search 356/39, 246, 244, 356/205, 83, 180; 250/106 SC; 235/l5l.35,

- 61.6 R, 61.6 A, 61.6 B, 616 1-1; 73/423 A,

[56] References Cited UNITED STATES PATENTS 3,571,596 3/1971 Frank et al.... 250/106 SC Nov. 27, 1973 9/1971 Scordato et a1 356/39 3,593,568 7/1971 Schmitz et al. 356/39 3,526,125 9/1970 Gilford et a1. 73/53 3,635,678 1/1972 Seitz et al. 356/39 3,523,737 8/1970 Wood et a1. 356/180 Primary Examiner--Thomas J. Sloyan Attorney-Willis M. Ertman [5 7]. I ABSTRACT Incubation apparatus for use with a cuvette having a projecting processing control member and a plurality of Chambers, at least one of which contains a stored chemical material includes a cuvette receptacle with adjacent heaters for incubating material in the cuvette, sensor circuitry responsive to the control member of the cuvette in the container receiving structure for producing an output signal as a function of the data provided by the control portion, and a timer responsive to the sensor circuitry for providing a control signal as an indication of the incubation of the euvette. The receptacle also includes an interlock slot for receiving the projecting control member.

' 12 Claims, 7 Drawing Figures I PMENIEDNMPJ? ma 3775.595 SHEET NF 2 ticularly adapted for use in 1 APPARATUS FOR PROCESSING CHEMICAL MATERIALSHELD I'N CONTAINER STRUCTURES This application is a'division of our copending patent application Ser. No. 45,758, filed June 12, 1970, entitled Analysis System Employing a Plural Chamber Cuvette Structure, now US. Pat. No. 3,703,336, issued Nov. 21, 1972. I 1

SUMMARY OF INVENTION This invention relates to analysis systems. A needexi'sts for instrumentation that produces accurate chemical analysis data and which can be operated by untrained personnel. Such instrumentation would assist laboratories in contending with the shortage of skilled personnel and as such should minimize the number of operations required, eliminate the need for calculations, and present the analysis results directly, accurately and unambiguously. Chemical analyses may be performed in a variety of manners. In photometric analyses, for example, measurements may be made directly, by comparison with a standard, or as a function of the rate of chemical change. Such techniques are frequently employed in the analysis of blood or other body fluids. Frequently as part of a diagnostic procedure, a chemical analysis of a sample of such fluids for enzymes, hemoglobin, chloresterol, glucose etc.

provides useful diagnostic information. While laboratory services for performing such analyses are available,'the use of such services often entails a delay of several days or more before analysis information is available.

It is an object of this invention to provide a novel and improved analysis system which facilitates operation of analysis instrumentation by untrained personnel.

Another object of the inventionis to provide a novel and improved instrumentation ,foruse with prepackaged chemical materials which enables such materials to be stored in a reliable manner, and to easily be used in obtaining analysis information. I

A further object of this invention is to provide novel and improved analysis instrumentation.

Another object of the invention isto provide novel and improved chemical! analysis instrumentation parthe analysis ofblood samples.

A further object of the invention is to provide a novel and improved analysis system which enables the performance of complex blood chemical analytical procedures with the minimum of trained technique while ob- .taining data sufficiently accurate for diagnostic purposes.

Anotherv object of the invention is to provide a novel and improved incubation system which can be used for a wide variety of blood chemistry tests.

In accordance with the invention there is provided an apparatus for use with container structure having a processing control portion and a plurality of chambers, at least one of which contains a stored chemical material. The apparatus includes receptacle means for receiving the container structure, processor apparatus adjacent the container receiving structure for processing material in a container structure in the container receiving structure, sensor circuitry responsive to the control portion of the container structure in the container receiving structure for producing an output signal as a function of the data provided by the control portion, and indicator means responsive to the sensor circuitry output signal for providing a control signal as an indication of the processing of the container structure in the container receiving structure by the processor apparatus. I

In a particular embodiment, the processing control portion is a projecting control member and the container receiving receptacle means includes an interlock slot for receiving theprojecting control member. The sensor circuitry includes a light source and a plurality of light sensors, the light source and the light sensors being arranged to respond to the control portion and the container receptacle including decoding logic for producing the control signal as a function of the output signals of the light sensors. A first group of light transmitting channels and a corresponding second group of light transmitting channels are disposed between the light source and the light sensors, each second light transmitting channel being disposed between a corresponding aligned first channel and a corresponding light sensor, and the first and second groups of channels are spaced apart so that the control portion may be interposed between them to control transmission of light from the source to the sensors.

1 A plurality of container receiving structures are provided in a preferred embodiment, each container structure having cooperating processor apparatus, sensor circuitry and indicator means, and each container receiving structure further includes an interlock slot adapted to cooperate with a projecting control member of the container to limit insertionof container structures into the container receiving structures. Heaters are adjacent each container receiving structure for subjecting a container to an incubation cycle. The position of the interlock slot is coordinated with the heat output of the processor. Thus the projecting control provides an indication of both the magnitude and duration of the incubation cycle.

Other objects, features and advantages of the invention will be seen as the following description of a particular embodiment progresses, in conjunction with the drawings, in which:

FIG. 1 is a perspective view of components of a biochemical analysis system constructed in accordance with the invention;

FIG. 2 is a side view, with parts broken away, of the cuvette assembly shown in FIG. 1;

FIG. 3 is a sectional view of the cuvette assembly taken along the line 33 of FIG. 2;

FIG. 4 is a sectional view of the cuvette assembly taken along the line 4-4 of FIG. 2;

FIG. 5 is a top plan diagrammatic view of the cuvette assembly and an incubator unit of the apparatus shown in FIG. 1;

FIG. 6 is a diagrammatic sectional view taken along the line 6-6 of FIG. 5; and

FIG. 7 is a block diagram of the photometric system of the apparatus shown in FIG. 1.

DESCRIPTION OF PARTICULAR EMBODIMENT With reference to FIG. 1 there is shown a biochemical analysis instrument that includes a housing 10 on which is mounted a dispensing unit 12 having two dispensing channels 14-1 and 14-2. To the right of the dispensing unit 12 is an incubator section 16 that includes incubator chambers 18-1 18-8. At the top of each incubator chamber is an interlock slot 20 and above each chamber is an indicator light 22. A photometer section 24 is disposed above the incubator section 16 and includes a slot 26 for receiving a cuvette assembly 40; a card reader unit 28; a digital display 30; a units display 32; a start button 34 and an alarm lamp 36. Used with this instrument is a disposable cuvette assembly 40 and a correlated card 42 which includes a data section 44 having calibrating and control information and an instruction section 46. In a typical system, a kit of twenty cuvette assemblies 40,a supply of a standard (if necessary) for usewith the cuvette assemblies 40 and a control card 42 having coded calibrating and control information correlated with the standard material and the analysis to be performed is supplied for use with the instrument. A different kit is provided for each'type of analysis.

The cuvette assembly 40, as shown in FITS. 2-4, is formed of two components, a top 48 and a body portion 50, both formed of suitable material such as glass, or a polymeric material such as a polyolefin, a polycarbonate, or an acrylic. A preferred material is a transparent TPX methylpentene polyolefin material that has an absorbtion of approximately 0.125 optical density at a wavelength of 3400 Angstroms a vicat softening point of 179C; and excellent chemical resistance properties.

The body 50 has two side walls 52, 54, each 0.050 inch thick, that taper outwardly from bottom to'top at an angle of about, 1. Side walls 52, 54 are joined together at their bottom by base wall 56. As indicated in FIGS. 2 and 3, three sample chambers 60-1, 60-2 and 60 -3 and a handle chamber 62 are formed in the cuvette assembly. These chambers are defined by lateral separator wall members 64 that have a thickness at their upper ends of about 0.040 inch. Each sample chamber 60 has a transverse width between side walls 52, 54 of about inch and a lateral width of about inch. The height of the cuvette assembly is l inches and its length is four inches. Instruction and/or labeling information may be secured to one or both inner surfaces of the handle chamber 62. Formed in the outer surface of each side wall of the three sample chambers 60 is an optical surface 70 about 9/16 inch in height and having a surface finishin the order of five microinches. Each surface is recessed about 0.005 inch to provide a protective zone. In the optical area defined by surface 70, the side wall thickness in each chamber 60 is maintained with a tolerance of 0.0004 inch of the mean wall thickness of the three chambers. The optical path lengths of the three chambers thus are identical within close tolerances.

The cover member 48 has a downwardly projecting ridge 72 which engages the upper surface of the body 50 and, after chemical material has been introduced into one or more of the chambers 60, a hermetic seal of the chambers 60 and 62 is provided as by ultrasonic welding. In the upper wall of each chamber is formed a frangible section 74 of reduced thickness which may be broken away to permit introduction of materials such as a reconstituting agent or the unknown to be analyzed into the sample chambers 60. An interlock key 76, divided into two sections 76-1 and 76-2, projects from the upper surface of the cover member 48. Either section 76-1 or 76-2 may be omittted thus varying the coding.

As shown in FIGS. 5 and 6, each incubator chamber 18 is of cast aluminum and is disposed behind an aperture in the front wall 80 of the instrument. Immediately behind wall is a thermal insulator member 82 which provides thermal isolation between areas outside the instrument and the incubator resistance heater rod elements 84, 86. Four of the incubator chambers (18-1 18-4) have thermistor controlled heaters set at 37C and controlled to maintain temperature within 0.3C and the other four incubator chambers (18-5 18-8) have thermistor controlled heaters set at 100C and controlled to maintain temperature within 1C. A light source is associated with each pair of incubator chambers 18 and four transmitting fiber optic channels 92, two in each direction, extendfrom light source 90 with their remote ends supported in the corresponding insulator member 82. A corresponding aligned pair of receiving fiber optic channels 94 are secured in the opposed insulator member and are coupled via photodiodes 96 to timing and control logic 98 which provides three different timing intervals and in turn operates indicator lamp 22 and an audible buzzer (not shown). Normally light from lamp 90 is fed via transmitting fiber optic channels 92 to the receiving fiber optic channels 94 for sensing by photosensors 96. When a cuvette assembly 40 is inserted in a proper incubator chamber 18, the location of projection 76 on the left or right side of assembly 40 being keyed to the position of interlock slot 20, one or both sections 76-1, 76-2, (depending on the coding) block the transmission of light to sensors 96 and operate timing logic 98 to initiate a timing cycle. With this coding three different timing cycles may be initiated, and it will be obvious that other additional timing cycles may be obtained by varying the nature of the coded control tab 76. At the end of the timing cycle selected, logic 98 produces an output that energizes lamp 22 and the buzzer to indicate to the operator that the cuvette assembly 40 'in'that incubator chamber is ready for photometric analysis.

A block diagram of the photometric section of the instrument is shown in FIG. 7. That section includes a shuttle 100 (disposed behind port 26) which receives and secures the cuvette assembly 40 in a predetermined location and which is driven via shuttle drive linkage by a motor 102. The shuttle drive sequentially positions the three chambers 60 in an optical path 104 that extends from a twenty watt quartz iodine radiation source 106 through filter wheel 108 to photodiode r'adiation sensor 110. The filter wheel 108 is in the form of a disc and has six circumferentially disposed filter elements and is rotated by a motor 112. The position of the filter disc is sensed by cooperation of slots in the filter disc and a plurality of photoelectric light sensors and logic (diagrammatically indicated at 114) which provide a binary coded output signal 'to compare circuit 116.

The card reader 28 which senses the data portion 44 of card 42 has a light source 118 and light distributing system 120 teat has 50 output channels 122 arranged in 5 X 10 matrix. A check channel is also provided to verify the proper positioning of the card in the reader. Each sensor channel of the card reader includes a light sensor 126, and one or more of the light sensors are coupled to translating logic 128 which applies control signals over output lines 130. The signals on line 130-1 are applied to control the operation of dispenser 12; the signals on output line 130-2 are applied as an input to comparison logic 116; the signals on output lines 130-3 8 are applied to control the signal processing circuitry that responds to material in the cuvette chambers; and the output signal on line 130-9 is applied to thedecimal display unit. The data on the card identifies the particular test and has dispensing information. and

' calibration information as afunction of the particular test and the chemicals supplied for performing the test.

compare circuit 116 and that signal applies an output over line 132 to control the filter wheel drive motor 112. Thus, in response to testrnode information stored on the card.42 that is correlated with a particular cuvette assembly 40, on insertion of that card into the card reader, the compare circuit 116 provides an output on line-132 to energize motor 112 and rotate filter wheel 108 until the proper filter element is positioned in the optical path 104. Motor 112 is then deenergized.

The output of radiation sensor 110 is applied to a log converter circuit 134 which provides an output as a logarithmic functionof the input signal from photodiode 110. Connected in circuit with the log converter arrangement is a switch 136 and a hold circuit 138. The output of the log converter circuit is applied through a first input of switch 140 to a digital voltmeter 142;

' along a second path through differentiator 144, filter network 146 and absolute value amplifier 148 to a second input of switch 140; and along a third path through a first input of switch- 150; scaling amplifier. 152, switch 154 and storage circuit 156. The output of storage circuit 156 is applied to the reference input of the digital voltmeter 142 and to error logic 158 which has an output that energizes error indicator or alarm lamp 36 when the output of the hold circuit 156 deviates from preestablished limits as specified by data from the card reader supplied'on output line 130-8. Switch 150 has a second input froma precision voltage source 160. The circuitry also includes control logic 162 which responds to inputs from sensor 164 that provides an indication for position of the cuvette shuttle 100; inputs from the card reader over output lines 1306; and inputs from start button 34. The logic has outputs over line 170 to control switch 136, over line 172 to control a switch-in filter network 146, overline 174 to control. switch 154, over line 176 to the digital voltmeter 142 and the error logic 158 in a strobing operation, and on line 178 to control the shuttle drive motor 102. Additional information concerning this circuitry may be had with reference to US. Pat. No. 3,703,336.

A variety of biochemical analyses may be performed with this apparatus. The following table indicates typical examples of the types of tests that may be made with this apparatus:

components of thekit are related, as by color coding to facilitate operator handling.

This instrument as controlled by a card 42 and card reader 28 is operable in the following three modes:

I 5 Standard R x B)/ s .48) X K For example, output channel 130-2 appliesa signal to v Absolute R (A A X X Rate R dAx/dt X K An illustrative example of each mode follows. Determination of servum glucose uses the standard mode. All three cuvette chambers -1 60-3 contain 4 milliliters of liquid reagent (6 percent orthotoluidine in glacial acetic acid) when it is received by the user. Under the control of card reader 28 and the corresponding glucose data card 42, the card reader has an output over channel 1311-] to control dispenser 12 and load dispenser channel 14-1 with one hundred microliters with a glucose serum standard (containing a precisely predetermined 200 milligrams per milliliters, and that is coordinated with the glucose data card 42) and channel 14-2 is loaded with one hundredmicroliters of a sample of the serum to be analyzed (typically that of a patient). A cuverte is then positioned so that chamber 60-2 and 60-3 are aligned with channels 14-1 and 14-2, respectively, and these volumes are discharged into those chambers. Nothing is added to chamber 60-1. After the chambers have been resealed and the contentsmixed by inversion, the cuvette assembly 40 is placed in one of the 100C incubator units 18-5 18-8 and incubated for twenty minutes.

When the incubation period is complete, the lamp 22 above that chamber lights (and an audible alarm is sounded). With the glucose data card 42 in the card reader 28, the card causes motor 112 to stop the filter wheel 108 so that the 6400 Angstrom filter is disposed in the optical path 104 between the lamp 106 and photodiode by an output signal over line -2. Gain factors are adjusted in the log converter circuit 134 by an output over line 130-4 and in the scaling amplifier 152 by an output over line 130-6. The card reader also closes switch so that the output from the log converter circuit 134 is applied directly through switch 150 to the scaling amplifier 152, and energizes an appropriate decimal point, and the appropriate units display 32. Depression of thestart button 34 applies a signal over line 166 to logic 162 which in turn generates a control signal over line 178 to energize the shuttle drive motor 102.

Initially the cuvette assembly is in the position shown in FIG. 7 (position 1). The shuttle drive advances the cuvette assembly to position 2 so that chamber 60-1 is positioned in the optical path 104. During these inter- Incubation Incubation temperature, Normal time Test X/nm. Units 0. range minutes Glucose, ortho toluidine condensation procedure 640 Mg./100 ml. 100 60-100 20 Urea (B UN), diacetyl monoxime procedure... 525 Mg./100 ml. 100 8-18 15 Hemoglobin, cyarlmethemoglobin 505 G./l00 ml. 37 10-23 5 Total protein, biuret method 525 G./100 ml. 37 6-8 15 Cholesterol, Liebermann-Burchard reaetio 640 Mg. [100 ml. 37 110 -250 10 Total bilirubin 525 Mg./100 ml. 37 0. 61. 5 5 LDH, Wacker 340 IU 37 12-50 10 GOT, Karmen 340 IU 37 5-10 10 CPR, Roaslli- 340 IU 37 12-90 10 Alkaline phosphatase, Bessey-Lowry 404 IU 37 13-42 10 For each test, a kit of correlated material is supplied, a typical kit including a set of twenty cuvettes 40, a supply of a standard for use with the twenty cuvettes and calibrating data card 42 which contains control data for theparticular test including data on the standard; The

vals, the shuttle position sensor 164 indicates to the 65 logic circuitry 162 the position of the cuvette and during these intervals, the logic circuitry 162 produces an output over line to close the switch 136 in the log converter feedback path, applying the output signal from the log converter through switch 136 and storage circuit 138 as a feedback to the log converter circuit 134 in a zeroing operation. Since chamber 60-1 contains only the blanksolution (no glucose standard or unknown was added to this chamber) the intensity of light striking the photosensor 110 and its output current corresponds photometrically to the zero concentration of glucose. The log converter circuit 134 has this current applied to it and produces an output voltage equal to the log of the input current. This output signal is fed back through switch 136 and storage circuit 138 as a reference current to the log converter circuit. Switch 136 is then opened and the storage circuit 138 holds this voltage and continues to apply a reference current to the log converter that is proportional to the negative intensity of the blank solution.

The shuttle mechanism, after an interval of about two seconds in position 2, advances the cuvette to position 3 so that standard chamber 60-2 is positioned in the optical path 104. This action is sensed by sensor 164 and applies a signal to logic circuitry 162 to produce an output signal on line 174 to closeswitch 154. The gain of the scaling amplifier 152 has been set from signals from the card reader over line 130-6 to calibrate the scaling amplifier as a function of the standard glucose solution supplied with the card. During the interval that the standar in chamber 60-2 is in path 104, the current generated by sensor 110 causes the log converter 134 to produce an output voltage proportional to log of the absorbance of the standard minus the absorbance of the blank (A -A After amplification in accordance withthe calibrating information from the card reader, this signal is stored as a voltage in storage circuit 156 and applied to the reference voltage input of the digital voltmeter 142.

The shuttle mechanism, again after interval of about two seconds, advances the cuvette so that the third (unknown) chamber 60-3 is positioned in the optical path 104. Sensor 164 produces a position four output signal to the logic circuitry 162 and that circuitry removes the output signal on line 174 so that switch 154 is opened. The output from the log converter 134 is applied through switch 140 to the analog voltage input of the digital voltmeter 142. This output with the chamber 60-3 in the optical path 104, is proportional to the log of A -A (the absorbance of the unknown minus the absorbance of the blank). The output of the digital voltmeter applied to display 30 in response to the strobing signal on line 176 is:

( x AB)/(AS AB) X K The number displayed is directly proportional to the concentration of glucose in the unknown serum and the units display 32 indicates that this number is displayed in units of milligrams per one hundred milliliters.

Determination of hemoglobin by the Cyanmethemoglobin procedure employs the absolute mode. In this measurement, chamber 60-1 is empty and is unused in the analysis sequence, and each of chambers 60-2 and 60-3 as supplied in the kit has four milliliters of a reagent. A potassium cyanide tablet is inserted into each chamber 60-2 and 60-3 by the technician to complete the reagent and the dispenser 12 is controlled by output 130-1 of card reader 28 to load fifty microliters of the patients blood into dispenser channel 14-2. The dispenser is then operated to discharge fifty microliter sample of whole blood into cuvette chamber 60-3. The

- sponse to an output on line 130-2; logic 162 is signalled contents of the cuvette assembly, after the chambers are sealed, are mixed by inversion and the cuvette is incubated in a 37C unit for five minutes. When the incubation period is complete (indicated by the corresponding light 22), the hemoglobin control card 42 is placed in card reader 28 and the incubated cuvette assembly 40 is placed in shuttle carrier 100. The card and card reader produces an output on line -2 which causes the filter drive motor 112 to position the 5050 Angstrom filter in the optical path 104 and sets the gains of log converter 134 and scaling amplifier 152. In addition, switch is set to connect the output of the log converter to the analog input of the digital voltmeter in response to card reader output on line 130-7, and switch is set to connect precision'voltage source to the reference input of the digital voltmeter 142 via scaling amplifier 152, switch 154 and storage circuit 156.

Upon depression of start button 34, logic 162 causes motor 102 to advance the cuvette assembly 40 from position 1 through position 2 to position 3. Logic circuit 162 conditions switch 136 to maintain the log converter circuitry in zeroing mode until position 3 is reached (and chamber 60-2 is positioned in the optical path 104). In this position the output of the log converter circuit 134 is A --the absorbance of the material in chamber 60-2. The log converter zeroing operation is terminated by an output from sensor 164 via logic 162 to switch 136 as the cuvette 40 is advanced by shuttle 100 to position the chamber 60-3 in optical path 104. The output of the log converter 134 is now the value A -Ag and is applied via switch 140 to the analog input of digital voltmeter 142. The strobing pulse is generated by logic 162 on line 176 to gate the output value generated by digital voltmeter 142 to digital display 30, and at the same time the strobing pulse applied to the error logic to check whether the scaled precision voltage value is within a preset limit as determined by anoutput from the card reader on line 130-8. As in the other cases, if the output voltage is outside those limits lamp 36 is energized. Display 30 displays the digital value of hemoglobin in grams per 100milliliters, the digital voltmeter 142 having generating the ratio (A A X k/v, the output being an absolute absorbance measurement of the sample minus a standard.

Enzyme analyses made in a rate mode. For example, in a determination of lactic dehydrogenase (LDH) by the Wacker method, civette assembly 40 when received by the technician has a reagent in powder form in chamber 60-2 only. Three milliliters of distilled water are added to chamber 60-2 to reconstitute the reagent and the materials then mixed by inversion and then incubated at 37C for 10 minutes. When the incubation period is complete, 100 milliliters'of serum is added to chamber 60-2, the chamber is resealed and subjected to mixing and then reincubation at 37C. The corresponding LDH data card 42 is inserted in. card reader 28; filter wheel 108 is rotated to position the 3400 Angstrom filter in the optical path 104 in rethat a rate mode of operation is to be performed in response to an output on line 1150-3; the log converter 134 is calibrated in response to an output on line 130-4;

switch 140. is set to connect the output of amplifier 148' to the analog input of digital voltmeter 142 in response to an output on line 130-7; switch 150 is set to connect precision voltage source 160 to the reference input of digital voltmeter 142 in response to an outputoriFne 130-5; and the units are set by an output on line 130-9.

In this mode, after the incubated cuvette assembly 40 has been inserted in shuttle 100 upon depression of start button 34, the shuttle is advanced until chamber 60-2 is positioned in the optical path 104. At that point motor 102 is stopped. The log converter 134 has been in a zeroing mode. The initial absorbance reading,. transformed to voltage, has been established by the zeroing operation of the log converter circuit 134 ends.: 10

Starting from this point a linearly increasing 'voltage ramp is monitored overa period of time. This ramp signal is differentiated by differentiator circuit 144 to pro-, vide a signal which is passed by filter 146 and absolute;

value amplifier I48 through switch 140 to the analogf input of digital voltmeter 142. At the end of the timing; interval, the digital voltmeter is strobed by an output on line 176 to digitally display a reading in international units of the amount of lactic dehydrogenase in the serum.

Thus the invention provides a convenient and versatile system for performing a variety of chemical analyses and is particularly useful in performance of analyses of blood and other body fluids. Both mode selection and calibrating information is furnished by a control record. The analysis sequence is automatically performed in any of the modes solely in response to depression of start button 34. No manual adjustments are required. The system is easilyoperated by untrained personnel and enables analytical information to be made available quickly, accurately and inexpensively.

While a particular embodiment of the invention has been shown and described, various modifications thereof will be apparent to those skilled in the art. For

example, the sample chambers may be disposed in a cu- What is claimed is:

1. Apparatus for use with container structure having a processing control portion having one or more segments and a plurality of chambers, said process control portion having one or more data providing segments and at least one of said chambers containing a stored chemical material comprisingz h structure for receiving said container structure, said,

container receiving structure including interlock structure for cooperation with said processing control portion, said interlock structure preventing insertion into said container receiving structure of' container structures having processing control. p0r- 5 5 tions improperly coordinated with said interlock structure,

processor apparatus adjacent said container receiving structure for processing material in a container structure in said container receiving structure,

sensor circuitry responsive to said processing control: portion of the container structure when said container structure is in said container receiving structure for producing an output signal as a function of data provided by said processing control portion, 5

said output signal responsive means including indicator means responsive to said sensor circuitry output r signal for providing a controlsignal as an indication of the processing of the container structure in said container receiving structure by said processor apparatus.

2. The apparatus as claimed in claim 1 wherein said 5 output signal responsive means includes timer means.

3. The apparatus as claimed in claim 1 wherein said processor apparatus comprises heater means adjacent said container receiving structure for subjecting a container structure in said container receiving structure to an incubation cycle.

4. The apparatus as claimed in claim 1 wherein said sensor circuitry includes a light source and a plurality of light sensors, said light source and said light sensors being arranged to respond to said processing control portion and said container receiving structure includes decoding logic for producing said control signal, as a function of the output signals of said light sensors.

5. The apparatus as claimed in claim 4 wherein said sensor circuitry includes a plurality of first light transmitting channels disposed between said light source .and a corresponding plurality of second light transmitting channels, each said second light transmitting channel being disposed between a corresponding aligned first channel and a corresponding light sensor, and said first and second channels being spaced apart so that said processing control portion may be interposed therebetween to control transmission of light from said source to said sensors.

6. The apparatus as claimed in claim 1 wherein said processing control portion is a projecting control member and said interlock structure includes an interlock slot for receiving said projecting control member.

,7. The apparatus as claimed in claim 1 wherein said apparatus includes two container receiving structures, eachsaid container receiving structure having cooperating processor apparatus, sensor circuitry and indicator means, and the interlock structure of one of said container receiving structures being different from the interlock structure of the other container receiving structure so that the same container structure cannot be inserted into both container receiving structures.

8. The apparatus as claimed in claim 7 wherein said processing control portion is a projecting control member and each said interlock structure includes an interlock slot for receiving said projecting control member.

9. The apparatus as claimed in claim 7 wherein each said processor apparatus comprises heater means adjacent said container receiving means for subjecting a container structure in said container receiving means to an incubation cycle.

10. The apparatus as claimed in claim 9 wherein each said sensory circuitry includes a light source and a plurality of light sensors, said light source and said light sensors being arranged to respond to said processing control portion and said container receiving means includes decoding logic for producing said control signal as a function of the output signals of said light sensors, and said output signal responsive means includes timer means for producing an incubation cycle durationindication.

11. The apparatus as claimed in claim 10 wherein said processing control portion is a projecting control member and each said interlock structure includes an interlock slot for receiving said projecting control member.

12. The apparatus as claimed in claim 11 wherein said sensory circuitry includes a plurality of first light so that said projecting control member may be interposed therebetween to control transmission of light from said source to said sensors to define the duration of said incubation cycle. 

1. Apparatus for use with container structure having a processing control portion having one or more segments and a plurality of chambers, said process control portion having one or more data providing segments and at least one of said chambers containing a stored chemical material comprising: structure for receiving said container structure, said container receiving structure including interlock structure for cooperation with said processing control portion, said interlock structure preventing insertion into said container receiving structure of container structures having processing control portions improperly coordinated with said interlock structure, processor apparatus adjacent said container receiving structure for processing material in a container structure in said container receiving structure, sensor circuitry responsive to said processing control portion of the container structure when said container structure is in said container receiving structure for producing an output signal as a function of data provided by said processing control portion, said output signal responsive meanS including indicator means responsive to said sensor circuitry output signal for providing a control signal as an indication of the processing of the container structure in said container receiving structure by said processor apparatus.
 2. The apparatus as claimed in claim 1 wherein said output signal responsive means includes timer means.
 3. The apparatus as claimed in claim 1 wherein said processor apparatus comprises heater means adjacent said container receiving structure for subjecting a container structure in said container receiving structure to an incubation cycle.
 4. The apparatus as claimed in claim 1 wherein said sensor circuitry includes a light source and a plurality of light sensors, said light source and said light sensors being arranged to respond to said processing control portion and said container receiving structure includes decoding logic for producing said control signal as a function of the output signals of said light sensors.
 5. The apparatus as claimed in claim 4 wherein said sensor circuitry includes a plurality of first light transmitting channels disposed between said light source and a corresponding plurality of second light transmitting channels, each said second light transmitting channel being disposed between a corresponding aligned first channel and a corresponding light sensor, and said first and second channels being spaced apart so that said processing control portion may be interposed therebetween to control transmission of light from said source to said sensors.
 6. The apparatus as claimed in claim 1 wherein said processing control portion is a projecting control member and said interlock structure includes an interlock slot for receiving said projecting control member.
 7. The apparatus as claimed in claim 1 wherein said apparatus includes two container receiving structures, each said container receiving structure having cooperating processor apparatus, sensor circuitry and indicator means, and the interlock structure of one of said container receiving structures being different from the interlock structure of the other container receiving structure so that the same container structure cannot be inserted into both container receiving structures.
 8. The apparatus as claimed in claim 7 wherein said processing control portion is a projecting control member and each said interlock structure includes an interlock slot for receiving said projecting control member.
 9. The apparatus as claimed in claim 7 wherein each said processor apparatus comprises heater means adjacent said container receiving means for subjecting a container structure in said container receiving means to an incubation cycle.
 10. The apparatus as claimed in claim 9 wherein each said sensory circuitry includes a light source and a plurality of light sensors, said light source and said light sensors being arranged to respond to said processing control portion and said container receiving means includes decoding logic for producing said control signal as a function of the output signals of said light sensors, and said output signal responsive means includes timer means for producing an incubation cycle duration indication.
 11. The apparatus as claimed in claim 10 wherein said processing control portion is a projecting control member and each said interlock structure includes an interlock slot for receiving said projecting control member.
 12. The apparatus as claimed in claim 11 wherein said sensory circuitry includes a plurality of first light transmitting channels disposed between said light source and a corresponding plurality of second light transmitting channels, each said second light transmitting channel being disposed between a corresponding aligned first channel and a corresponding light sensor, and said first and second channels being spaced apart so that said projecting control member may be interposed therebetween to control transmission of light from said source to said sensors to define the duration of said incubation cycle. 